Rotating mechanism and injection device

Abstract

The utility model discloses a rotating mechanism and an injection device. The rotating mechanism comprises a rotating component, a fixing component, a connecting component and an elastic piece, the fixing component is arranged between the rotating component and the connecting component, and the fixing component has a blocking state for blocking the rotating component from rotating in the first direction and a receding state for enabling the rotating component to rotate in the second direction; the connecting component is clamped with the fixing component, the connecting component limits the circumferential movement of the fixing component, and the fixing component can slide in the axial direction of the connecting component; the elastic piece is arranged between the fixing component and the connecting component, and the elastic piece can elastically deform so that the fixing component can be in the blocking state or the avoiding state. According to the rotating mechanism and the injection device, the connecting component and the fixing component are combined into a whole, the connecting component limits the fixing component, loosening in the using process is avoided, a plurality of components can be assembled into a whole in advance before overall installation, and the installation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a rotating mechanism and an injection device. Background Art

[0002] Diabetic patients need an insulin syringe that is portable and easy to use. There are related injection products on the market. Most syringes use the screw drive principle, which allows the push rod to move forward through rotation. Most syringes are used in basically the same way. First, turn the tail screw to the desired scale, then insert the needle at the other end into the body to be injected, and then push the tail push handle to inject the drug. During the injection process, a sound-generating mechanism is provided to produce a clicking sound, forming an audible feedback of the drug injection. The sound-generating mechanism is usually composed of a rotating component, a fixed component, a connecting component, and an elastic component. The rotating component and the fixed component both have one-way gears, and the one-way gears are meshed with each other. The fixed component is sleeved in the connecting component. When the rotating component rotates, the one-way gears mesh and jump to produce a sound.

[0003] However, in the existing technology, there is no fixed connection relationship between the connecting component and the fixed component, and there is no anti-slip mechanism between the two. The one-way gear between the rotating component and the fixed component may become loose, thereby failing to play its due role. During installation, several components are installed separately, and the positions need to be aligned during installation. Since the parts are small in size and difficult to find the position, there are problems of low installation efficiency and poor stability. Utility Model Content

[0004] The main technical problem solved by the utility model is to provide a rotating mechanism and an injection device, which combine the connecting component and the fixing component into one, avoid loosening and facilitate installation, and avoid all or some of the above-mentioned defects.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a rotation mechanism for an injection device, the rotation mechanism comprising a rotation member, a fixing member, a connecting member and an elastic member;

[0006] wherein the fixing member is provided between the rotating member and the connecting member, the fixing member being in a blocking state for blocking the rotating member from rotating in a first direction, and the fixing member being in a avoiding state for allowing the rotating member to rotate in a second direction, wherein one of the first direction and the second direction is a clockwise direction, and the other of the first direction and the second direction is a counterclockwise direction;

[0007] The connecting member is engaged with the fixing member, the connecting member limits the circumferential movement of the fixing member, and the fixing member can slide along the axial direction of the connecting member;

[0008] The elastic member is disposed between the fixing member and the connecting member, and the elastic member can be elastically deformed to place the fixing member in the blocking state or the avoiding state.

[0009] When the elastic member is compressed, the fixing member slides toward the direction close to the connecting member, and the fixing member is in the avoidance state; when the elastic member is released, the fixing member slides toward the direction away from the connecting member, and the fixing member is in the blocking state.

[0010] Wherein, the rotating component is provided with a first one-way gear, and the fixed component is provided with a second one-way gear meshing with the first one-way gear.

[0011] The connecting member is hollow, with a truncated cone on the inner wall, a clamping hole provided axially on the side of the truncated cone, a clamping groove provided on the inner wall of the connecting member near the clamping hole, and a through hole provided at the center of the truncated cone.

[0012] The fixing member further comprises a body, an extension portion and a clamping portion, wherein the body is in the shape of a circular ring, the second one-way gear is provided on the circular surface of one side of the body, the extension portion is connected to the other side of the body, and the clamping portion is protrudingly provided on the end of the extension portion away from the body;

[0013] The extending portion is passed through the clamping hole, the clamping portion is accommodated in the clamping groove, and the main body is in contact with one side of the truncated table.

[0014] Wherein, two ends of the elastic member are respectively in contact with the main body and the truncated cone.

[0015] Wherein, the elastic member is a spring.

[0016] Wherein, the rotating mechanism further includes a push rod, which is passed through the rotating component and threadedly connected to the rotating component. At the same time, the push rod is passed through the connecting component and plugged into the connecting component.

[0017] The outer surface of the push rod is provided with a groove along the axial direction and a discontinuous external thread interrupted by the groove;

[0018] The rotating member is hollow, and its inner wall is provided with internal threads adapted to the external threads; the inner wall of the connecting member is provided with clamping strips, and the clamping strips are clamped into the grooves, so that the push rod can slide along the axial direction of the rotating member and at the same time limit the rotation of the push rod.

[0019] To solve the technical problems, the present application further provides an injection device, and the injection device includes the rotating mechanism described in any one of the above.

[0020] Compared with the prior art, the beneficial effects achieved by the rotating mechanism and the injection device of the present utility model are as follows: the connecting member and the fixing member are combined into one body, and the connecting member forms a limit on the fixing member to avoid loosening during use, and multiple members can be assembled into one body in advance before overall installation, improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments. Obviously, the following described drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0022] Figure 1 is the exploded structural schematic diagram of the rotating mechanism of the present utility model;

[0023] Figure 2 is Figure 1 the structural schematic diagram of the rotating member in

[0024] Figure 3 is Figure 1 the structural schematic diagram of the fixing member in

[0025] Figure 4 is Figure 1 the structural schematic diagram of the connecting member in

[0026] Figure 5 is the structural schematic diagram of the push rod;

[0027] Figure 6 is the structural schematic diagram of the injection device of the present utility model;

[0028] Figure 7 is the sectional view of the injection device;

[0029] Figure 8 is Figure 7 the partial enlarged view of part A in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0031] In all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, they are only used to explain the relative position relationship and movement conditions between components in a certain specific posture (as shown in the accompanying drawings). If this specific posture changes, then the directional indications will also change accordingly. The terms "first", "second", etc. in this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0032] The mention of "embodiment" in this article means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0033] Please refer to Figures 1 to 8 , Figure 1 which is a schematic structural diagram of the rotating mechanism of the present utility model. The rotating mechanism of this application is used for the injection device 100, specifically applied to an injection pen. The rotating mechanism includes a rotating member 1, a fixed member 2, a connecting member 3 and an elastic member 4. The rotating member 1 is used to drive the rotation and is the component for active rotation. The fixed member 2 is the component in contact with the rotating member 1, and the one-way teeth between them are engaged. When the rotating member 1 rotates, the one-way teeth jump and make a sound when engaged. Due to the blocking of the fixed member 2, the rotating member 1 can only rotate in one direction. The connecting member 3 is snap-connected to the fixed member 2 and is used to carry the fixed member 2 and the elastic member 4. The elastic member 4 has elasticity and can be stretched and compressed along the axial direction of the rotating member 1, so as to adjust the distance between the fixed member 2 and the rotating member 1.

[0034] Specifically, the fixing member 2 is disposed between the rotating member 1 and the connecting member 3. The fixing member 2 has a blocking state that blocks the rotation of the rotating member 1 in the first direction, and the fixing member 2 has an avoidance state that allows the rotating member 1 to rotate in the second direction. Among them, one of the first direction and the second direction is the clockwise direction, and the other of the first direction and the second direction is the counterclockwise direction. The above setting enables the rotating member 1 to rotate only in one direction, and the rotating member 1 is blocked from rotating in the opposite direction.

[0035] The connecting member 3 is snap-connected to the fixing member 2. The connecting member 3 limits the circumferential movement of the fixing member 2. The fixing member 2 can slide axially along the connecting member 3. The above setting enables the fixing member 2 to only slide axially along the connecting member 3 and will not axially separate, but cannot rotate. During the process of the fixing member 2 sliding axially along the connecting member 3, the distance between the fixing member 2 and the rotating member 1 changes. Specifically, when the fixing member 2 slides in the direction close to the rotating member 1, the distance between the fixing member 2 and the rotating member 1 decreases. At this time, the fixing member 2 is in a blocking state for the rotating member 1, and the rotation of the rotating member 1 in the first direction is blocked and cannot rotate. When the fixing member 2 slides in the direction away from the rotating member 1, the distance between the fixing member 2 and the rotating member 1 increases. At this time, the fixing member 2 is in an avoidance state for the rotating member 1, and the rotating member 1 can rotate in the second direction.

[0036] The elastic member 4 is disposed between the fixing member 2 and the connecting member 3. The elastic member 4 can elastically deform to make the fixing member 2 in a blocking state or an avoidance state. The working state of the elastic member 4 is a compressed state, which is used to apply an elastic force to the fixing member 2 in the direction towards the rotating member 1, so that the fixing member 2 is always in contact with the rotating member 1.

[0037] Specifically, when the rotating member 1 squeezes the fixing member 2, the elastic member 4 is compressed, and the fixing member 2 slides in the direction away from the rotating member 1, that is, slides in the direction close to the connecting member 3. The distance between the fixing member 2 and the rotating member 1 increases. At this time, the fixing member 2 is in an avoidance state. When the elastic member 4 is released, due to the elastic force of the elastic member 4, the fixing member 2 slides in the direction close to the rotating member 1, that is, slides in the direction away from the connecting member 3. The distance between the fixing member 2 and the rotating member 1 decreases, and the fixing member 2 is in a blocking state.

[0038] Due to the use requirement that the rotating member 1 and the fixed member 2 are always in contact, with the above structure, the connecting member 3 and the fixed member 2 are integrated. The connecting member 3 limits the fixed member 2. The two can slide axially but will not separate axially, avoiding loosening during use, so that the fixed member 2 cannot effectively contact the rotating member 1 and thus cannot play its due role. At the same time, the fixed member 2, the connecting member 3 and the elastic member 4 can be assembled into one body in advance before overall installation, improving the installation efficiency.

[0039] In this application, a first one-way gear 11 is provided on the rotating member 1, and a second one-way gear 21 meshing with the first one-way gear 11 is provided on the fixed member 2, so that the rotating member 1 rotates unidirectionally relative to the fixed member 2 through the action of the first one-way gear 11 and the second one-way gear 21. The fixed member 2 has a blocking state in which the first one-way gear 11 meshes with the second one-way gear 21, and the fixed member 2 has an avoidance state in which the first one-way gear 11 and the second one-way gear 21 are disengaged from each other and the rotating member 1 rotates in the second direction. The elastic member 4 presses the fixed member 2 into the blocking state by elastic force, and the connecting member 3 limits the circumferential movement of the fixed member 2 to prevent the fixed member 2 from rotating. The fixed member 2 cooperates with the first one-way gear 11 through the second one-way gear 21 to prevent the rotating member 1 from rotating in the first direction. Driving the rotating member 1 to rotate in the second direction can enable the first one-way gear 11 to drive the second one-way gear 21 and the fixed member 2 to slide away from the rotating member 1, and the fixed member 2 presses the elastic member 4 into the avoidance state, so as to facilitate the unidirectional rotation of the rotating member 1 by external driving. Among them, one of the first direction and the second direction is the clockwise direction, and the other of the first direction and the second direction is the counterclockwise direction, which can be specifically set according to actual use requirements.

[0040] In this application, the connecting member 3 is hollow, and a frustum 31 is provided on the inner wall. A clamping hole 32 is provided axially on the side of the frustum 31, and the clamping hole 32 penetrates the frustum 31. A clamping groove 33 is also formed on the inner wall of the connecting member 3 near the clamping hole 32, and a through hole 34 is provided at the center of the frustum 31.

[0041] In this application, the fixed member 2 further includes a body 22, an extension portion 23 and a clamping portion 24. The shape of the body 22 is circular ring-shaped, and the second one-way gear 21 is provided on the circular ring surface on one side of the body 22. The extension portion 23 is connected to the other side of the body 22, and the clamping portion 24 protrudes from the end of the extension portion 23 away from the body 22. When the fixed member 2 is fixedly installed with the connecting member 3, the extension portion 23 passes through the clamping hole 32, the clamping portion 24 is received in the clamping groove 33, the body 22 abuts against one side of the frustum 31, and the clamping portion 24 and the body 22 are located on different sides of the frustum 31, and the fixed member 2 and the connecting member 3 form a clamping connection.

[0042] In one embodiment, the connecting member 3 is a cylindrical structure, and the fixing member 2 and the elastic member 4 are accommodated in the hollow space of the connecting member 3. The number of the clamping holes 32 is two, which are symmetrically arranged on both sides of the connecting member 3. The number of the extension parts 23 and the clamping parts 24 is also two, which are symmetrically arranged. During installation, the extension parts 23 are inserted into the clamping holes 32, and the clamping parts 24 are accommodated in the clamping grooves 33, so that the connecting member 3 and the fixing member 2 are integrated. The above structure limits the fixing member 2 by the connecting member 3, and the fixing member 2 cannot rotate and can only slide within a small range.

[0043] In the present application, the two ends of the elastic member 4 are respectively abutted against the body 22 and the frustum 31. The elastic member 4 is accommodated in the hollow space of the connecting member 3, and the two ends are respectively abutted against the fixing member 2 and the connecting member 3.

[0044] Preferably, the elastic member 4 in the present application is a spring.

[0045] The rotating mechanism in the present application further includes a push rod 5. The push rod 5 passes through the rotating member 1 and is threadedly connected to the rotating member 1. At the same time, the push rod 5 passes through the connecting member 3 and is inserted into the connecting member 3. When the rotating member 1 rotates unidirectionally, since the push rod 5 and the connecting member 3 are axially guided and matched, the push rod 5 does not rotate throughout the process, and at the same time, the screw rod 5 can slide axially relative to the connecting member 3.

[0046] In the present application, a groove 51 is axially provided on the outer surface of the push rod 5, and at the same time, discontinuous external threads 52 interrupted by the groove 51 are provided.

[0047] The rotating member 1 is hollow, and an internal thread 12 adapted to the external thread 52 is provided on the inner wall. The push rod 5 passes through the through hole 34. A clamping strip 35 is provided on the inner wall of the connecting member 3. The clamping strip 35 extends axially along the connecting member 3, and the width is slightly smaller than the width of the groove 51. The clamping strip 35 is clamped into the groove 51, so that the push rod 5 can slide axially along the rotating member 1, and at the same time, the rotation of the push rod 5 is limited. During the use of the injection device, the rotating member 1 rotates, and the push rod 5 does not rotate and only slides in the axial direction, enhancing the stability of the structure.

[0048] To solve the technical problems, the present application further provides an injection device 100, and the injection device 100 includes the rotating mechanism of any one of the above.

[0049] Using the rotating mechanism and the injection device of the present utility model, the connecting member and the fixing member are combined into one body. The connecting member limits the fixing member to avoid loosening during use, and multiple components can be assembled into one body in advance before the overall installation, improving the installation efficiency.

[0050] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A rotating mechanism for an injection device, characterized in that, The rotating mechanism includes a rotating member, a fixed member, a connecting member, and an elastic member; Wherein, the fixed member is disposed between the rotating member and the connecting member. The fixed member has a blocking state that blocks the rotation of the rotating member in a first direction, and the fixed member has an avoidance state that allows the rotating member to rotate in a second direction. One of the first direction and the second direction is the clockwise direction, and the other of the first direction and the second direction is the counterclockwise direction; The connecting member is snap-connected to the fixed member. The connecting member limits the circumferential movement of the fixed member, and the fixed member can slide axially along the connecting member; The elastic member is disposed between the fixed member and the connecting member. The elastic member can elastically deform to make the fixed member in the blocking state or in the avoidance state.

2. The rotating mechanism according to claim 1, wherein, When the elastic member is compressed, the fixed member slides in a direction close to the connecting member, and the fixed member is in the avoidance state; when the elastic member is released, the fixed member slides in a direction away from the connecting member, and the fixed member is in the blocking state.

3. The rotating mechanism according to claim 1, wherein A first one-way gear is provided on the rotating member, and a second one-way gear meshing with the first one-way gear is provided on the fixed member.

4. The rotating mechanism according to claim 3, wherein, The connecting member is hollow, and a frustum is provided on the inner wall. A snap hole is provided axially on the side of the frustum. A card slot is also opened on the inner wall of the connecting member near the snap hole. A through hole is provided at the center of the frustum.

5. The rotating mechanism according to claim 4, characterized in that, The fixed member further includes a body, an extension portion, and a snap portion. The shape of the body is circular. The second one-way gear is disposed on the circular surface on one side of the body. The extension portion is connected to the other side of the body. The snap portion protrudes from the end of the extension portion away from the body; The extension portion passes through the snap hole, the snap portion is received in the card slot, and the body abuts against one side of the frustum.

6. The rotating mechanism according to claim 5, wherein, Both ends of the elastic member abut against the body and the frustum respectively.

7. The rotating mechanism according to any one of claims 1-6, characterized in that, The elastic member is a spring.

8. The rotating mechanism according to claim 1, characterized in that, The rotating mechanism further includes a push rod. The push rod passes through the rotating member and is threadedly connected to the rotating member. At the same time, the push rod passes through the connecting member and is inserted into the connecting member.

9. The rotating mechanism according to claim 8, wherein, The outer surface of the push rod is provided with a groove axially, and at the same time, discontinuous external threads interrupted by the groove are provided; The rotating member is hollow, and internal threads adapted to the external threads are provided on the inner wall; a card strip is provided on the inner wall of the connecting member. The card strip is snapped into the groove, so that the push rod can slide axially along the rotating member, and at the same time, the rotation of the push rod is limited.

10. An injection device, characterized in that, The injection device includes the rotating mechanism according to any one of claims 1-9.

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